Last login: Mon Jan 29 13:36:35 on ttys000

michael at wifi-10-44-54-69 in ~/Dropbox/Projects/cs88/cs88/src on main [!?]
👉 cd assets/slides/sp24/

michael at wifi-10-44-54-69 in ~/Dropbox/Projects/cs88/cs88/src/assets/slides/sp24 on main [!?]
👉 python3 -i 04
04-Sequences.pdf   04-Sequences.pptx  04-Sequences.py    

michael at wifi-10-44-54-69 in ~/Dropbox/Projects/cs88/cs88/src/assets/slides/sp24 on main [!?]
👉 python3 -i 04-Sequences.py 
H
e
l
l
o
,
 
C
8
8
C
!
55
55
H
e
l
l
o
,
 
C
8
8
C
!
Traceback (most recent call last):
  File "/Users/michael/Dropbox/Projects/cs88/cs88/src/assets/slides/sp24/04-Sequences.py", line 69, in <module>
    text.count(8)
TypeError: must be str, not int
>>> 
>>> 
>>> 
>>> text
'Hello, C88C!'
>>> text[0]
'H'
>>> text[1]
'e'
>>> text[2]
'l'
>>> index = 0
>>> while index < len(text):
...     print(text[0])
...     index += 1
... 
H
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>>> while index < len(text):
...     print(text[index])
...     index += 1
... 
>>> index = 0
>>> while index < len(text):
...     print(text[index])
...     index += 1
... 
H
e
l
l
o
,
 
C
8
8
C
!
>>> 
>>> index = 0
>>> while index < len(text):
...     print(text[index])
... 
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^CH
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Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyboardInterrupt
>>> while index < len(text):
... 
KeyboardInterrupt
>>> 
>>> 
>>> text
'Hello, C88C!'
>>> 
>>> for letter in text:
...     print(letter)
... 
H
e
l
l
o
,
 
C
8
8
C
!
>>> 


>>> 
>>> 
>>> for num in range(0, 10):
...     print(num)
... 
0
1
2
3
4
5
6
7
8
9
>>> for num in range(1, 10 + 1):
...     print(num)
... 
1
2
3
4
5
6
7
8
9
10
>>> total = 0
>>> stop = 10
>>> for num in range(1, stop + 1):
...     total += num
... 
>>> total
55
>>> 
>>> 
>>> 
>>> 
>>> 
>>> help(range)
Help on class range in module builtins:

class range(object)
 |  range(stop) -> range object
 |  range(start, stop[, step]) -> range object
 |  
 |  Return an object that produces a sequence of integers from start (inclusive)
 |  to stop (exclusive) by step.  range(i, j) produces i, i+1, i+2, ..., j-1.
 |  start defaults to 0, and stop is omitted!  range(4) produces 0, 1, 2, 3.
 |  These are exactly the valid indices for a list of 4 elements.
 |  When step is given, it specifies the increment (or decrement).
 |  
 |  Methods defined here:
 |  
 |  __bool__(self, /)
 |      True if self else False
 |  
 |  __contains__(self, key, /)
 |      Return key in self.
 |  
 |  __eq__(self, value, /)

>>> rnage(10, 0, -1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'rnage' is not defined. Did you mean: 'range'?
>>> range(10, 0, -1)
range(10, 0, -1)
>>> list( range(10, 0, -1) )
[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
>>> 
>>> 
>>> def sum_test(n):
...     total = 0
...     for i in range(n + 1):
...             total += i
...             print(total)
...             return total
... 
>>> sum_t
sum_test(       sum_to_n(       sum_to_n_down(  
>>> sum_test(10)
0
0
>>> result = sum_test(10)
0
>>> result
0
>>> text[3]
'l'
>>> 


>>> 
>>> nums = list( range(1, 11))
>>> nums
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> nums[0]
1
>>> nums[9]
10
>>> text[9]
'8'
>>> nums[0:5]
[1, 2, 3, 4, 5]
>>> text[0:5]
'Hello'
>>> nums[0:5, 2]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers or slices, not tuple
>>> nums[0:5:2]
[1, 3, 5]
>>> text[0:5:2]
'Hlo'
>>> range(0, 5, 2)
range(0, 5, 2)
>>> 
>>> 
>>> 
>>> 'e' in text
True
>>> 4 in nums
True
>>> 100 in nums
False
>>> 8 in text
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand, not int
>>> text.count('8')
2
>>> text.count
<built-in method count of str object at 0x100b103b0>
>>> len
<built-in function len>
>>> len(text)
12
>>> nums[0][1]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not subscriptable
>>> 
>>> 
>>> help(sum)
Help on built-in function sum in module builtins:

sum(iterable, /, start=0)
    Return the sum of a 'start' value (default: 0) plus an iterable of numbers
    
    When the iterable is empty, return the start value.
    This function is intended specifically for use with numeric values and may
    reject non-numeric types.
(END)

































Help on built-in function sum in module builtins:

sum(iterable, /, start=0)
    Return the sum of a 'start' value (default: 0) plus an iterable of numbers
    
    When the iterable is empty, return the start value.
    This function is intended specifically for use with numeric values and may
    reject non-numeric types.
~
~
~
~
~
~
~
~
~
~
~
~
~

>>> 
>>> 
>>> sum(range(1, 10 + 1))
55
>>>